Apparatus for presetting the rotational speeds of parts used to create the deformation of a metal in order to obtain wires or strips, such as by wire drawing machine blocks

ABSTRACT

Apparatus for the presetting of the rotational speeds of the various blocks of a multiple wire drawing machine by simple dialling on dials or rules corresponding respectively to each block, at first of the finished wire diameter, then of the wire diameter at each pass.

United States Patent Tranier Sept. 5, 1972 [54] APPARATUS FOR PRESETTINGTHE ROTATIONAL SPEEDS OF PARTS USED TO CREATE THE DEFORMATION OF A METALIN ORDER TO OBTAIN WIRES OR STRIPS, SUCH AS BY WIRE DRAWING MACHINEBLOCKS [72] Inventor: Jean Tranier,Vaires, France [73] Assignee: OfficeTechnique Des Tretiles,

Vincennes, France [22] Filed: July 10, 1970 [21] Appl. No.: 53,734 [30]Foreign Application Priority Data Aug. 5, 1969 France ..6926791 [52] US.Cl. 272/289 72/8, 72/443 [51] Int. Cl ..BZlc 1/02, 1321b 37/12, B21j7/12 [58] Field of Search ..72/274, 278, 279, 287, 288,

[56] References Cited UNITED STATES PATENTS Zelley ..72/32 1,341,6516/1920 Lammers ..72/279 3,314,264 4/1967 Vater et al ..72/443 3,518,8597/1970 Brinkebom et a1 ..72/443 1,653,097 12/ l 927 Hodgson ..72/2892,232,993 2/1941 Berquist ..72/289 2,266,861 12/1941 Haase ..72/2891,281,439 10/1918 Vicaire ..72/288 FOREIGN PATENTS OR APPLICATIONS748,448 5/1956 Great Britain ..72/ 289 Primary Examiner- Richard J.Herbst Assistant ExaminerMichael J. Keenan Att0rneyWenderoth, Lind &Ponack [5 7] ABSTRACT Apparatus for the presetting of the rotationalspeeds of the various blocks of a multiple wire drawing machine bysimple dialling on dials or rules corresponding respectively to eachblock, at first of the finished wire diameter, then of the wire diameterat each pass.

6 Claims, 10 Drawing Figures PATENTEUSEP 5 m2 SHEET 1 0F 3 JEAN L.M.IRANIER, Inventor Attorneys FATENTED SEP 5 I972 3.688.546

sum 2 OF 3 Attorneys PATENTEDsEP 5 i972 3.688.546

sum 3 or 3 JEAN L.M. TRANIER, Inventor APPARATUS FOR PRESETTING THEROTATIONAL SPEEDS OF PARTS USED TO CREATE THE DEFORMATION OF A METAL INORDER TO OBTAIN WIRES OR STRIPS, SUCH AS BY WIRE DRAWING MACHINE BLOCKSThe present invention has as principal subject a simple andmathematically precise method allowing the operator to set, without anyprevious calculation, the base speeds of each of the blocks forming amultiple wire drawing machine so that each block revolves with correctspeed corresponding to non-slip wire drawing process withoutaccumulation nor wire unwinding and this whatever the finisher speed andthe dies used in the sequence may be. The process can also be applied tothe wire collecting device (separate coiler or spooler) when the wire isnot directly collected on the last multiple wire drawing machine block.

The process can also be applied to any process of continuous multiplepass deformation such as rod rolling mills or strip rolling mills.Although we limit ourselves to give the principle and one realizationexample applicable to a multiple wire drawing machine, the sameprinciple and realizations of same kind can be applied to tandem rollingmills without leaving the spirit of the invention.

With the above and other objects in view which will become apparent fromthe detailed description below, a preferred form of the invention isshown in the drawings in which:

FIG. 1 is a diagrammatic set of seven dials wherein the finishingdiameter is 5.0 mm.

FIG. 2 is a similar view in which the finishing diameter is 8.0 mm.

FIGS. 3 and 4 are similar diagrammatic views illustrating the positionsof the various hairlines after dialing the sequences above.

FIG. 5 is a diagrammatic view of a divider.

FIG. 6 is a diagrammatic view illustrating the various resistances.

FIG. 7 is a diagrammatic view illustrating in more detail one of theresistances.

FIG. 8 is a perspective view showing the seven dials corresponding tothe seven machine blocks.

FIG. 9 is a diagrammatic view illustrating the movement of the finisherlever and the intermediate block levels, and

FIG. 10 is a perspective view illustrating a practical realizationadapted to the electrical system.

The result aimed for, i.e., the setting of the considered parts isobtained by the worker operating the machine by two simple operations,the effect of which will be explained later, i.e.,

Dialling by means of one dial A, corresponding to the finisher, in frontof one fixed hairline, of the finisher die diameter,

Dialling on the dial B1 B2 B3 Bn, corresponding each to one intermediateblock by means of a movable hairline, of each of the die diameters usedin sequence, i.e., D1 D2 D3. Dn.

Eventually a complementary operation will consist in dialling on anotherdial or on a selecting device the drum diameter of the collecting spoolor the nominal diameter of the block used for coiling.

In case of a continuous rolling mill the same selection could be appliedin order to take the real rolling mill roll diameter into account.

Finally the operator can dial, in a way already known in itself, thefinisher wire drawing speed.

The present invention can naturally only be applied to multiple wiredrawing machines or continuous tandem rolling mills; each of which ofthe intermediate blocks or intermediate stands being susceptible to bedriven at variable speed. This result, in the present state of technicalknowledge can be obtained in three ways Each block or stand is driven bya variable speed V electric motor,

Each block or stand is driven by a variable speed hydraulic motor,

Each block or stand is driven, starting from a single motor or a singleshaft line by a variable reduction ratio transmission, the speed of thesingle motor or the single shaft line itself being susceptible to beunchangeable or changeable without leaving the spirit of the inventionof our method.

The invention not referring to the means of speed variation, it will besupposed, in a way already known in itself or in any other way likely tobe invented later, that the motor appliance used for the drive of eachof the blocks or stands is suceptible to give to this block or thisstand a tangential speed proportional to the value of the signal whichwill be given to it by the device making use of the process subject ofthe invention.

It is admitted that an electric DC. motor will take a rotational speedand therefore will give to the block or stand a tangential speedproportional to its armature voltage which itself will be proportionalto the voltage at the entry of a thyristor piloting amplifier cell.

In hydraulics, it is admitted that a hydraulic motor with a fixedcylinder capacity will take a rotational speed and therefore will giveto the block or stand a tangential speed proportional to the oil volumedischarged by a variable delivery pump, a delivery which itself will beproportional to the linear or angular movement of its delivery variationmechanism.

Regarding speed variation, it is similarly admitted that thetransmission ratio established by the speed variation device will giveto the block or stand a tangential speed proportional to the linear orangular movement of its servomotor.

As stated previously, we shall give in the following part only theprinciples and the realization examples applicable to a multiplestraight through wire drawing machine, it being well understood that thesame principle and similar realization examples can be applied to anycontinuous rod or strip tandem rolling mill.

At the multiple non-slip wire drawing process, without accumulation, norunwinding as defined above, the calculation of the wire speeds at thevarious blocks is reduced for each intermediate block to the resolutionof one of the equations regarding this block with regard to thefinisher:

respectively the wire speed at the same blocks.

Although these simple equations allow to make all the calculationsnecessary for the knowledge of the tangential speeds of each block as afunction of the successive wire diameters and the finisher speed, theycannot be used as such for a physical actualization on a machine of aprocess of presetting of the tangential speeds of the various blocks bysimple dialling of the diameter D, D D D D,r on the appropriate dials asit is the principal aim of the invention.

On the contrary, if the equations a be written in logarithmic notation,they become:

2 log D log V, 2 log D log V 2 log D log V 2 log D,- log V l log V,, logV; 2 (log D,r log D,,)

it can be seen then that each of these equations lends itself to aphysical actualization in form of kinematic vectors obtained by simpleparts such as lever arms, pinions, or chain or timing belt drive.

It is indeed sufficient, for anyone n of the wire drawing machineintermediate blocks, to add algebraically the vectors proportional tolog V 2 log D and 2 log D,, in order to get a vector proportional to logV which will serve to pilot the tangential speed of block n.

It is advanced above that it was admitted in a very general way that thetangential speed of a block could, by known means, be supposed to beproportional to the piloting value (electric voltage, hydraulicdelivery, rectilinear or rotating movement of a mechanical part).However, it is endeavoured to put this piloting value into a physicalactual form by a vector which is actually proportional to the logarithmof the value aimed at.

The possibility naturally exists to reconcile these two considerationsin a way as accurate as it is desired and in a range theoreticallyinfinite, e.g., e.g., by interposition of cans out according to anappropriate law or by use of amplifier cells answering this same law,but this is an useless complication in practice.

As in fact, if it is referred to equations b represented by anyone amongthem, e.g., 2 log D, log V 2 log D log V the possible variation of logV,, with regard to log V, is limited to a range of values compatiblewith the possible variation of log D, with regard to log D itselflimited in practice by metallurgical considerations, it is not necessaryto look for a proportionality on a very large scale of values.

However, there exists a point in the logarithmic scale for which thedifferential of an arithmetic value is equal to the differential of itslogarithm. If the axiom is applied that the variation of a function isminimal in the vicinity of the point where this value passes itself by aminimum, it will be sufficient to choose for center point of the settingin plus or minus which it is desired to operate, the equality point ofthe differentials.

In practice, and in decimal logarithms, this point correspondsapproximately to log 4.5 0.6532. The practical application of thisascertainment will be seen later.

The appliance built according to the invention will comprise a certainnumber of dials, as many as the wire drawing machine comprises blocks;all the dials equal in diameter, being graduated according to alogarithmic scale of appropriate modulus, equal for all dials, each dialbeing alloted to one block.

All the dials are linked in rotation, one to each other, by any means,such as e.g., gear of ratio 1 l with interposition of an intermediate inorder to keep the same rotating direction for all the dials or by a setof chains of ratio 1 l, or yet by a common shaft carrying a certainnumber of worms gearing each one with a hollow tooth wheel integral witha dial. On building of the appliance, however, the dials are angularlyoffset with regard to that of the finisher in order to reproduce thevarious reduction ratios of the kinematic chain of the wire drawingmachine so that, for a same speed of all the motors or a same positionof the individual speed variation devices, the angle shown by the dialof each intermediate block with regard to that of the finisher is equalto half of the difference of log V log V in accordance with the chosengraduation modulus. These angular offsettings are therefore on thebuilding of the appliance, the actualization of the kinematic chain ofthe wire drawing machine for which the appliance is built.

As an example, the FIGS. 1 and 2 reproduce the whole set of dials of aseven block wire drawing machine, the kinematic chain of which has beenarbitrarily chosen so that the tangential speeds of the various blocksfor a same speed of the various motors or a same position of the variousspeed variation devices answer the following equations.

log V, log V 0.50 log V; log V -0.40 log V log V 0.30 log V log V 0.20log V =log V,-0.l0 log V, log V 0.05

Equations D If these equations are compared to the correspondingequations C, it is deduced after resolution:

log D, log D,- 0.25 log D log D,- 0.20 log 0;, log 13,- 0.15 log D logD,P 0.10 log D, log D, 0.05 log D, log D; 0.025

Equations F Vvvvvv dial 1 360 X 0.25 dial 2 360 X 72 dial 3 360 X 0.1554 dial 4 360 X 0.10 36 dial 5 360" 9 0.05 18 dial 6 360 X 0.025 0 andthe whole set of the seven dials takes for example the aspect of FIG. 1when a finishing diameter of 5.0

mm is dialled and that of FIG. 2 when a finishing diameter of 8.0 mm isdialled.

The dial corresponding to the finisher is the only one accessible to arevolution operated by the operator for the purpose of dialling on thisdial, in front of a fixed hairline, the finishing die diameter. However,any amount of revolution applied to this dial brings about a revolutionequal and in the same direction as all the dials corresponding to theintermediate blocks and the whole set is locked after dialling of thefinisher diameter which entails that the offsettings referred to in theprevious paragraph are always maintained.

The actualization of the dialling of the intermediate die diameters isobtained on each corresponding dial by moving a hairline in front of thelogarithmic graduation which has become fixed by the locking operationstated in the previous paragraph.

As an example and by using, as basis, the two finishing diameterdiallings shown on FIGS. 1 and 2, in each of the cases, a wire drawingsequence is supposed, voluntarily simplified, and only made up ofpreferential numbers according to French standard NF X01 /.00l, thesepreferential numbers being supposed to be taken as representing antilogsof an accurate arithmetic series in the ratio of 0.050 (series R 20) inthe spirit of the preferential number principle. Therefore, afterwards D8.0 represents actually D 7.943 antilog 0.90 and D 5.6 representsactually D 5.6 represents actually D 5.623 antilog 0.75.

It is equally voluntarily supposed that the sequence finishing at 5.0 mmcomprises seven passes as follows:

D; 5 .0 whereas the sequence finishing at 7.1 mm only comprises fivepasses by bypassing the fifth and sixth blocks as this can be done inpractice.

B not used D not used The FIGS. 3 and 4 show respectively the positionsof the various hairlines after dialling both the sequences above.

It is then seen, on analyzing the positions of these various hairlines,that their respective angular offsetting with regard to the verticalrepresenting the finisher diameter dialling represents very preciselythe physical actualization of each of the equations c.

If the dial 3 in FIG. 3 is taken as an example, it can be seen that theangular offsetting of its hairline is equal to [360 X(l0g 8.0 log5.0)]-54=(360 0.20) 54 72 54 18 whereas the hairline of dial 3 in FIG. 4shows an offsetting equal to [360 (log 9.0-log 7.l)] 54 (360 0.l0) 54 3654=- 18.

This positive or negative angular offsetting represents therefore veryprecisely the actualization of vector log V of the equations c,paragraph 4.2.

As it was suggested previously, the proportionality between alogarithmic vector and the value which it represents is the mostapproaching one (and largely sufficient in practice) around a pointdefined by log 4.5 0.6532.

Therefore it will be sufficient to choose on the kinematic part servingas material support to vector log V, and which will be called afterwardsby the term Divider, the median point from which the correction in plusor minus is made at 45 percent from one of the ends and at 55 percentfrom the other end and in such an orientation that any vectormodification in the way of a speed reduction is made towards theshortest portion of the divider and any modification in the way of aspeed increase is made towards the longest position of this part asshown on FIG. 5.

It can be seen that in these conditions a variation of the vector log Vof or 0.10 corresponding theoretically to a variation of the true valueV, of 125, entails an error in the region of 1 percent only which can beperfectly admitted in practice and is completely within the spirit ofthis invention.

Now some examples to build the appliance will be given allowing to carryout the above invention with reference to FIGS. 1 to 10 of the attacheddrawings.

a. For DC. motors, it is naturally supposed that the various motors haveseparate feed and that the speed of each motor is proportional to theelectric voltage of a signal. The whole set, commercially availableunder various names, which receives this signal and feeds the motor withdirect current at the necessary voltage so that the motor rotationalspeed is proportional to this signal, will be referred to under thegeneric name amplifier.

Remaining within the above example of a seven block wire drawingmachine, the diagram is given in FIG. 6 in which 1 is a DC. generator,preferably at stabilized voltage,

2 is a variable potentiometric resistance serving for the general speedregulation of the wire drawing machine,

3 is a fixed potentiometric resistance feeding by its branch DE theamplifier of the finisher (divider for the finisher) 456-7-8 and 9 arevariable potentiometric resistances, all equal to each other and equalto the fixed resistance 3, each of them feeding the amplifier of anintermediate block by its branch GH (dividers for the intermediateblocks).

The potentiometric taking point E on the fixed resistance DF is situatedin such a point that branch DE represents 45 percent of the totalresistance DF.

Equally the median points H of the resistances GI are situated in such apoint that the branches GH represents 45 percent of the total resistanceGI which is equal to DF.

FIG. '7 reproduces with more detail the practical realization of anyoneof the resistances GI.

10 is a fixed resistance, the value of which is 35 percent of the totalresistance GI,

11 is a potentiometer, the value of which is 20 percent of the totalresistance G1,

12 is a fixed resistance, the value of which is 45 percent of the totalresistance GI.

It can be seen that in these conditions, for a central position of theslider of potentiometer 11, the resistance OH is 45 percent of GI, andequal to finisher resistance DE and that, for the two extreme sliderpositions, resistance GH varies between 35 percent and 55 percent of GI.

The practical realization is shown on FIG. 8 in which the references 13represent the seven dials corresponding to the seven machine blocks.

Each of these diais is fixed on a gear 14 with the above stated angularoffsetting and each gear engages a worm 15, all the worms being carriedon the same shaft 16 which can be operated by knurled button 17 andlocked into position by any system 18.

On the other hand, the six potentiometers 11 are disposed on a lineparallel to that of the seven dials.

On the shaft of each of those is keyed a gear 19 meshing with a timingbelt 20, itself driving a gear 21 coaxial with dial l3 and gear 14.

On gear 21 a hairline is fixed moving in front of the graduation of dial13.

The ratio of the tooth numbers of the gears 19 and 21 is chosen inaccordance with the logarithmic graduation modulus of the dials in sucha way that for the total length of stroke of one of the potentiometers 1l the angular movement of this hairline corresponds to the desireddegree of individual speed variation.

It is to be said that only the intermediate blocks are so equipped witha potentiometer and a movable hairline, the rotation of which is linkedto that of the potentiometer. In other words, the finisher has a fixedpotentiometric resistance and a movable dial in front of a fixedhairline whereas the intermediate blocks have a variable potentiometerand a movable hairline in front of a fixed dial.

b. For hydraulic motors.

In this case it will be supposed that each hydraulic motor is separatelyfed by a variable delivery pump, said pump being driven at a fixed speedby an asynchronous motor or by a shaft line.

The delivery variation of the pump, obtained by the rectilinear movementin case of a radial piston pump or by angular movement in case of anaxial piston pump, will always be driven by a hydraulic servo-motor insuch a way that the rotational speed of said motor is alwaysproportional to the movement of the part piloting the servo-motor.

In perfect analogy with the electrical speed control, the signal givento the pump servo-motor is proportional to a general speed signal and tothe ratio of the lever arms corresponding to the correction of thedesired relative speed with regard to the finisher speed.

FIG. 9 explains this diagram in which a rectilinear lever 22 sliding intwo bearings 23 is linked to seven elementary parallel levers of which24 is the finisher lever and 25 are the different intermediate blocklevers. The other end of the levers 24 and 25 is connected with a fixedpoint 26. Some device as e.g., a sliding movement in a slide 27 integralwith a casing 28 allows the angular movement of the levers 24 and 25.

On lever 24 and in a point L such as KL 45 percent of KM, theservo-motor drive of the finisher pump is taken.

On each of the levers 25 and in a point 0, the median position of whichis such as N0 45 percent of NP are taken the servo-motor drives of eachof the intermediate blocks. In order to be able to have this medianposition varied within the desired individual regulation limits, each ofthe levers 25 comprises a slide 29, and the spigot 30 materializingpoint 0 hangs on a swivelling arm, whose swivelling point R can bemoved; as desired, by a limited value.

The movement of point L and of each of the points 0 is transmitted tothe various pump servo-motors by any suitable rod system.

The practical realization, shown on FIG. 10, equally follows veryclosely the realization of the electrical system.

The system includes the seven dials 13 with their gears 14, worms 15,shaft 16, operating button 17 and locking system 18.

The dialling hairline appropriate to the intermediate blocks is carriedby a gear 32 coaxial with dial 13. This gear engages a worm 33 keyed toa shaft 34 carrying a knurled operating button 35 and some lockingdevice 36. On the other end of shaft 34 is situated another screwengaging a nut 37 linked to a point R oflever 31. The rotation of nut 37is prevented by any suitable system so that the rotation of shaft 34creates a linear movement of point R and consequently of point 0 oflever 31.

The reduction ratio of the worm-wheel-set 32/33, the pitch of nut 37 andthe total length of lever 31 are, of course, calculated in accordancewith the logarithmic dial modulus and the features of the pumpservo-meter in such a way that the movement of the hairline in front ofthe dials 13 be in relation to the required speed variation.

c. For mechanical speed variation devices.

The diagram and realization can be similar to the example given for thehydraulic motor being understood that the transformation process of alinear or angular movement into a reduction ratio change of a speedvariation device is supposed to be known in itself and is outside thescope of this invention.

It is stated above that the subject of this invention is to preset therelative speeds of the intermediate blocks with an approximation ofindustrial exactitude. If it is desired to proceed to non-slipstraight-through wire drawing process, this approximation is, however,not sufficient in itself. Application has to be made of a dancer rollplaced between the wire exit of an intermediate block and the entry ofthe wire into the following die according to an already known technique.The signal issued by this dancer roll by any means, already knows, suchas rheostat, induction regulators, etc. as regards the electric circuitsor by simple linear movement of a swivelling arm as regards control bylevers can, without any difficulty, be added algebraically to the signalissued from the predialling in order to give it the small necessarycorrection.

In case of the electric circuits, this signal, in form of a smalldifference of positive or negative potential will be sent to theamplifier of the intermediate block concerned.

IN case of regulation by kinematic elements the linear movementcorresponding to the position of each dancer roll will be linked withpoint N of each lever 29 and will so replace the fixed point 26 (FIG.9).

The invention process can finally be extended to the speed control of awire take-up device.

If the take-up device in question which can be, either a coilercollecting wire in coils or a spooler collecting wire on spools,comprises one only coiling diameter or one only reel size, the speedpresetting system which is applied to it, is strictly identical to thatwhich regulates the finisher speed, i.e., the taking point (E in theelectrical case or L in the mechanical case) is fixed on the divider. Itis only in case the take-up device can take 2 or several diameters thatthe invention process shows its value. It is sufficient in this casethat the divider comprises as many fixed taking points as there areblock diameters so that by simple circuit commutation the motor speed ofthe take-up device adjusts itself according to the diameter of thistake-up device and the general speed reference in order to give thedesired tangential speed to the take-up device.

What is claimed is:

l. An apparatus for equipping a multiple wire drawing machine comprisinga plurality of intermediary blocks, a die for each block, a motor fordriving each block, a finishing block receiving the wire once drawn,means regulating without preliminary calculation the speed of rotationof each of said intermediary blocks as a function of the speed of saidfinishing block to obtain a wire drawing without slipping, accumulationand curving, said means comprising a plurality of dials corresponding innumber to said blocks graduated according to the logarithmic scale,means for placing said various dials jointly in rotation, the dials ofsaid intermediary blocks being angularly set each one to a differentquantity with relation to the dial of said finishing block, meanscontrolling the rotation of said dial of said finishing block and meansfor posting opposite each of the logarithmic graduations of said dialsof said intermediary blocks a deflection acting upon the motor of eachof said intermediary blocks to vary the speed of rotation of saidintermediate blocks relative to the speed of rotation of said finishingblock.

2. An apparatus as set forth in claim 1 wherein said blocks are eachdriven by a direct current motor having means for rendering the speed ofeach motor proportional to the electric voltage of a signal comprising avariable potentiometric resistance for the regulation of the overallspeed of said wire drawing machine, a fixed potentiometric resistancefor said finishing block, a plurality of equal variable potentiometricresistances corresponding in number to said intermediary blocks equal tosaid potentiometric resistance of said finishing block and means forvarying said variable potentiometric resistances as a function of theangular displacements of said deflections with relation to thelogarithmic graduations of the various dials of said intermediaryblocks.

3. An apparatus according to claim 2 wherein means are provided defininga divider element for said finishing block comprising a fixedpotentiometric resistance for said finishing block, divider elements foreach of said intermediary blocks consisting of equal variablepotentiometric resistances equal to said divider element of saidfinishing block, means for determining a point of potentiometricdeduction upon said divider element of said finishing block located at apoint so that the branch of said divider element feeding said finishingblock r presents 45 percent of the total resistance and means ordetermining the reduction points for said divider elements of saidintermediary blocks whereby said points of reduction are located so thatthe branches of the resistances constituting said divider elementsrepresent 45 percent of the total value of each of said resistances.

4. An apparatus according to claim 3 in which the number of teeth of thegear driving said coaxial wheel is chosen as a function of thegraduation carried by the dials so that for the total course of one ofsaid potentiometers the angular displacement of said reference linecorresponds to the degree of variation of the individual speed desired.

5. An apparatus according to claim 3 in which said finishing blockcomprises a plurality of diameters, said divider element of saidfinishing block having a number of deduction points equal to the numberof diameters of said block whereby the commutation is carried outaccording to the diameter of the finishing block used, the variouspoints of deduction being harmoniously deducted around a point locatedat 45 percent of the total value of the divider element.

6. An apparatus according to claim 3 comprising dials in a numbercorresponding to the passes of the machine each fixed upon a gear withan angular deduction corresponding to the cinematic chain adopted, aplurality of endless screws, each one meshing with one of said gears, ashaft for said endless screws, means for rotating said shaft and lockingsaid shaft in a predetermined position, said regulating potentiometersof the voltage of said intermediary blocks being located parallel tosaid dials, a shaft for each potentiometer, a driving gear on saidshaft, a wheel coaxial to the corresponding dial having a reference linewhich is displaced according to the graduation of the correspondingdial.

1. An apparatus for equipping a multiple wire drawing machine comprisinga plurality of intermediary blocks, a die for each block, a motor fordriving each block, a finishing block receiving the wire once drawn,means regulating without preliminary calculation the speed of rotationof each of said intermediary blocks as a function of the speed of saidfinishing block to obtain a wire drawing without slipping, accumulationand curving, said means comprising a plurality of dials corresponding innumber to said blocks graduated according to the logarithmic scale,means for placing said various dials jointly in rotation, the dials ofsaid intermediary blocks being angularly set each one to a differentquantity with relation to the dial of said finishing block, meanscontrolling the rotation of said dial of said finishing block and meansfor posting opposite each of the logarithmic graduations of said dialsof said intermediary blocks a deflection acting upon the motor of eachof said intermediary blocks to vary the speed of rotation of saidintermediate blocks relative to the speed of rotation of said finishingblock.
 2. An apparatus as set forth in claim 1 wherein said blocks areeach driven by a direct current motor having means for rendering thespeed of each motor proportional to the electric voltage of a signalcomprising a variable potentiometric resistance for the regulation ofthe overall speed of said wire drawing machine, a fixed potentiometricresistance for said finishing block, a plurality of equal variablepotentiometric resistances corresponding in number to said intermediaryblocks equal to said potentiometric resistance of said finishing blockand means for varying said variable potentiometric resistances as afunction of the angular displacements of said deflections with relationto the logarithmic graduations of the various dials of said intermediaryblocks.
 3. An apparatus according to claim 2 wherein means are provideddefining a divider element for said finishing block comprising a fixedpotentiometric resistance for said finishing block, divider elements foreach of said intermediary blocks consisting of equal variablepotentiometric resistances equal to said divider element of saidfinishing block, means for determining a point of potentiometricdeduction upon said divider element of said finishing block located at apoint so that the branch of said divider element feeding said finishingblock represents 45 percent of the total resistance and means fordetermining the reduction points for said divider elements of saidintermediary blocks whereby said points of reduction are located so thatthe branches of the resistances constituting said divider elementsrepresent 45 percent of the total value of each of said resistances. 4.An apparatus according to claim 3 in which the number of teeth of thegear driving said coaxial wheel is chosen as a function of thegraduation carried by the dials so that for the total course of one ofsaid potentiometers the angular displacement of said reference linecorresponds to the degree of variation of the individual speed desired.5. An apparatus according to claim 3 in which said finishing blockcomprises a plurality of diameters, said divider element of saidfinishing block having a number of deduction points equal to the numberof diameters of said block whereby the commutation is carried outaccording to the diameter of the finishing block used, the variouspoints of deduction being harmoniously deducted around a point locatedat 45 percent of the total value of the divider element.
 6. An apparatusaccording to claim 3 comprising dials in a number corresponding to thepasses of the machine each fixed upon a gear with an angular deductioncorresponding to the cinematic chain adopted, a plurality of endlessscrews, each one meshing with one of said gears, a shaft for saidendless screws, means for rotating said shaft and locking said shaft ina predetermined position, said regulating potentiometers of the voltageof said intermediary blocks being located parallel to said dials, ashaft for each potentiometer, a driving gear on said shaft, a wheelcoaxial to the corresponding dial having a reference line which isdisplaced according to the graduation of the corresponding dial.